While this product may be thick and appear sturdy it does not work as it should. First, we have the jack, which does not raise the furniture high enough to slide the wheels under. Then we have the "inter-locking" height adjusters that do not interlock because they're made of cheap plastic and the jack does not fit on top like it is supposed to. Lastly, we have the wheel which are fairly stiff and made of plastic with no bearings. The furniture kept wobbling and sliding off the wheels while I was moving it, crushing my foot more than once and nearly smashing my wife in the face. I might as well have just put the furniture on top of a few matchbox cars instead of wasting nearly $40.00 for this s***.
100% do not recommend as I attempted to use these on a variety of furniture types and on carpet, linoleum and concrete all with the same results.

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These things will not stay under the object being moved. The wheels do not move freely and slips out from under what ever it is your moving. I tried to use these with 3 different types of furniture and found them to be more frustrating than just pushing everything across the floor without them. Nothing I moved was 900 lbs. The heaviest was maybe 200 lbs. I do NOT recommend these.

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BEWARE! If you are purchasing this to move your fridge to clean the coils in the back? Whoa, Don't do it! The lifting lever is 1. Unable to lift high enough on it's own to get dolly under the corner.
2. When you go to use the lifter with the "riser" (1) the damn lifter will slip out from under the the fridge! Dumping the fridge to the floor, and thrusting you forward into the cabinet! Not to mention throwing the dolly and nearly causing injury to my helper! I am so grateful the fridge did not take a bite out of her fingers! BEWARE !!!
It was returned and I am looking for something else with a longer extension lift blade..

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 nice tool to move my heavy sofa. I used to have to ask my friends to help move my sofa, now I have this fantastic tool and put them under my sofa, I can move it by myself.

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Overall the idea is great, but the sturdiness, maneuverability, and ease of the tool is based on the ability and strength of the tool, the person using it, & the weight/crafted of the pieced of the furniture a person is trying to move.

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I can now push my furniture around with the drawers loaded. Good for moderate sized items with legs. Got acouple of huge items that I purchased another product for.

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Movers itself are perfect, but the Lifter needs to be used with the cubes. Please see the video so you dont make the same mistake I did :)

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But...this is sad...the set is junk ... just not working ..the idea is good..first of all the length of flange on pick up device is way too short..it backs up as you try to lift.. the piano just just slides out..tried to use on higher furniture..using blocks etc..the device works accordingly but when placing again as you life it slides away even on lighter stuff..granddaughter says I can just push so why did i buy..we eneded up just pushing..I have hernia and was trying to be able to do on my own...but no...I did not return even though I wasted money ...but less than 50 dollars..oh well what a waste of money

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This is an amazing product. Simple to use and does the job! Highly recommend.